On Wed, Jun 29, 2016 at 12:09 PM, Richard Smith via cfe-commits < cfe-commits@lists.llvm.org> wrote:
> Hi all! > > I'd like to establish a policy for Clang's default language standard (if > none is specified with -std), as follows: > > Clang defaults to the most recent published standard for the selected > language that it fully implements. > > The practical impact of this is that clang++ will default to C++14 for C++ > compilations (for version 3.9 onwards) and will default to C++17 once our > implementation support is complete and the standard is published (whichever > happens later). > > I'd suggest that we apply the same policy for clang-cl, but if it's > important that we enable a not-yet-fully-implemented standard for cl > compatibility, that seems reasonable. > > The question of whether the default mode for the GCC-compatible driver > should be -std=gnuXXX or -std=cXXX is separate, but also likely worth > discussing. Enabling GNU keywords by default is a very odd choice, and if > we believe we can change our defaults without breaking the world then this > seems like a good time to do so. > Using cXXX instead of gnuXXX would break the world on PS4. So for sure with `-std=c++latest` we would end up proposing a patch to change this for the PS4 target to gnu++latest (or gnu++11 if gnu++latest is not feasible). (As I'm sure you're aware, we have pending to upstream a patch that makes -std=gnu++11 the default C++ language mode on PS4 (just blocked on fixing tests to not assume the existing std)). It may be feasible for us to use a "-std=gnu++latest" behavior and not have to have a PS4-specific default; CC'ing Warren and Paul. -- Sean Silva > > I also intend to make explicit in our documentation that our -std=XXX flag > enables the selected standard, *plus all relevant issues in Defect Report > status from the relevant language committee* (it doesn't make sense to > support a language without its bugfixes). > > Thoughts? > > _______________________________________________ > cfe-commits mailing list > cfe-commits@lists.llvm.org > http://lists.llvm.org/cgi-bin/mailman/listinfo/cfe-commits > >
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